if anyone I know has ever been part of a focus group regarding urinal design. Having travelled through many an airport and nearly every rest stop on I-80 8 I-70, between Omaha & Utah, I feel rather qualified.
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crux- n. a vital, basic, decisive, or pivotal point; something that torments by its puzzling nature; a perplexing difficulty; essence, heart, core, gist.
the crux of it 
After you cover the lower 48, I’d like to read your perspective of the world’s urinal/toilet design. Asia’s got some very interesting ones. For example, in Kuala Lampur’s Petronas towers, I encountered a traditional squat toilet (a hole in the floor with porcelain skid treads for the feet) mated to an auto-flush mechanism. The best of both worlds. Awesome!